Insulating-coupling for combined electric-light and gas fixtures



(N6 Model.) I

- U. S. PORSYTH.

INSULATING COUPLING FOR COMBINED ELECTRIC LIGHT AND.

GAS FIXTURES.

No. 350,355. Patented Oct. 5, 1886.

3:7I5; N \T B EN WITNEEEEE INVENTEIFI N PEKERS Phul Li|l ographcn Washington I74 Q U ITED STATES PATENT OF ieE.

CHARLES S. FORSYTH, OF PHILADELPHIA, PENNSYLVANIA.

INSULATING-COUPLING FOR COMBINED ELECTRIC-LIGHT AND' GAS FIXTURES.

EPECIFICATION forming part of Letters Patent No. 350,355, dated October 5, 1886. Application filed July s, 1886. Serial No. 201,412. (No model.)

To all whom it may concern.-

following to be a full, clear, and exact description of the invention, reference being had to the accompanyingdrawings, which form part of this specification, i11\vhicl1 Figure l is a side elevation of my improved coupling. Fig. 2 isaplan, and Fig. 3 a vertical section, of same.

My invention has for its object to provide an improved form of insulating-coupling for combined gas and electric-light fixtures.

My improvements consist in the peculiarconstruction and combination of parts hereinafter fully described and claimed.

Referring to the accompanying drawings, A represents a nut having an external screwthread, a, with which engages a cap, B, internallythreaded at I). Said nut Ahas a central recess, A, with flaring walls, which receives a box, 0, of insulating material, said box being in the form of a truncated pyran1id,or with in clined sides.

D represents amember of thecoupling having a threaded end, cl, for connecting with a chandelier-pipe, and having a head, d, with inclined sides, which head fits in the box 0.

'The cap B has a threaded boss or stem, I), for connection with a gas-outlet.

F is a washer,of rubber, leather, or insulating material,which fits between the cap 13 and the other members of the coupling, and isthe device usually employed to makethe coupling gas-tight.

By the construction described the members B and D, which receive the pipes, are thoroughly insulated from each otl,1er,'so that a grounding-circuit will not be established between them.

By making the head of the member D with inclined sides which fit in the box 0 the Weight of the chandelier tendsto make the coupling gas tight, drawing said head against the box and the latter against the walls of the recess in the nut.

What I claim as my invention is as follows:

1. The combination, with the nut A, having a flaring recess, A, of the insulating-box 0, having inclined sides, and the member D, having head (1, with similarly-inclined sides, substantially as shown and described.

2. The combination of nut A, having central recess, A, insulating-box 0, having the form of a truncated pyramid, member D, having head (1, which fits in said box, and cap B, substantially as shown and described.

3. An insulating coupling for combinedgas and electric-light fixtures, comprising a nut, A, a cap, B, a member,-,D, which fits in 6 said nut, and a box, 0, of insulating material, having inclined sides fitted in said nut and receiving the head of the member D, substantially as shown and described.

In testimony that I claim the foregoing ,I 70 have hereunto set my hand this 16th day of June, 1886. i

CHAS. S. FORSYTH.

Witnesses:

WILL H. POWELL, R. DALE SPARHAWK. 

